Any suggestions on how to mount this clock using only a single mounting point?
It has a pendulum so it needs to be relatively level. I tried to run a piece of wire between the holes hoping to fish a piece of string or something to create a triangle for mounting but no such luck.
Okay so you use (2) of those things. Do you have a level? If so put the level on the back of the clock over the mounting holes but where you can still see them. With a pencil mark the level where the mounting are. Now you have a template/ measurements for the mounting holes on a level. Now take that level and hold it on the wall where you want to mount it. Hold it level. Find your two marks and mark the wall in those locations. Now insert your little pokey hooks in the wall and hang.